In the example above, there is the orginal programming_languages list. #print new sublist that doesn't contain 'Python' This will not modify your original list, but will instead create a new one that satisfies a condition you set. List comprehension creates a new list from an existing list, or creates what is called a sublist. One of the ways to remove all occurrences of an item inside a list is to use list comprehension. How to Remove All Instances of an Item in A List in Python Using remove() alone does not accomplish that, and you may not want to just remove the first instance of the item you specified. What happens though when you want to remove all occurrences of an item? The other two occurrences of Python remain in the list. When remove() was used, only the first matching instance was removed – the one following the JavaScript value and preceeding the Java value. In the example above, the item with the value of Python appeared three times in the list. Let's look at the following example: programming_languages = This means that if in the list there is more than one instance of the item whose value you have passed as an argument to the method, then only the first occurrence will be removed. The remove() Method Removes the First Occurrence of an Item in a ListĪ thing to keep in mind when using the remove() method is that it will search for and will remove only the first instance of an item. Now, instead of getting a Python error when you're trying to delete a certain value that doesn't exist, you get a message returned, saying the item you wanted to delete is not in the list you're working with. If it doesn't exist, then show a message that says it is not contained in the list". #check if 'React' is in the 'programming_languages' listĪnother way to avoid this error is to create a condition that essentially says, "If this value is part of the list then delete it. It will return a Boolean value – True if the item is in the list or False if the value is not in the list. To avoid this error from happening, you could first check to see if the value you want to remove is in the list to begin with, using the in keyword. #ValueError: list.remove(x): x not in list If you specify a value that is not contained in the list, then you'll get an error – specifically the error will be a ValueError: programming_languages = Programming_languages.remove("JavaScript") # remove the value 'JavaScript' from the list Remove() will search the list to find it and remove it. To remove an element from a list using the remove() method, specify the value of that element and pass it as an argument to the method. How to Remove an Element from a List Using the remove() Method in Python If you need to remove an item by its index number and/or for some reason you want to return (save) the value you removed, use the pop() method instead. The remove() method does not return the value that has been removed but instead just returns None, meaning there is no return value. value is the specific value of the item that you want to remove from list_name.If you do not provide that, you'll get a TypeError – specifically you'll get a TypeError: list.remove() takes exactly one argument (0 given) error. remove() takes one single required argument.remove() is one of Python's built-in list methods.list_name is the name of the list you're working with.The general syntax of the remove() method looks like this: list_name.remove(value) The remove() method removes an item from a list by its value and not by its index number. The remove() method is one of the ways you can remove elements from a list in Python. ![]() ![]() ![]() How to remove all occurrences of an item.remove() removes only the first occurrence of an item.Remove an element from a list using remove().In this article, you'll learn how to use Python's built-in remove() list method.īy the end, you'll know how to use remove() to remove an item from a list in Python.
0 Comments
Leave a Reply. |